The first electronic computer ENIAC, from human brain calculation to computer calculation, is a long historical process, in which people constantly explore and innovate. With the rapid development of science and technology in the 20th century, the existing computing tools have been unable to cope with the mountain of data processing. Therefore, there is an urgent need to improve the computing tools. During the production, supply and marketing period of World War II, the Department of Electrician of Moore College of the University of Pennsylvania, together with Abedin Ballistics Research Laboratory, was responsible for providing the Army with six pyrometers every day, which was a very arduous and urgent task. Because each firepower meter has to calculate hundreds of trajectories, it takes 20 hours for a skilled calculator to calculate a trajectory flying for 60 seconds with a desktop computer, and it takes 15 minutes if a large differential analyzer is used. Since the war, Abedin Laboratory has continuously improved the differential analyzer and employed more than 200 employees, but the progress is still very slow. At that time, it was urgent to develop a new computer to improve the calculation speed of ballistic parameters to meet military needs. 1942 in August, Moakley of Moore College drafted a memorandum entitled "The Use of High-speed Electron Tube Computer Device", which aroused great interest of graduate student eckert. Later, eckert became the chief engineer of the first electronic computer. Moakley told Captain Goldstein many times that he wanted to develop an electronic computer. Goldstein is a military representative who is in contact with the team of Moore Department of Electrical Engineering in Abedin Laboratory. He was keenly aware of the great value of this new computer in solving the manufacturing difficulties of fire-fighting instruments, so he immediately reported to his boss and received enthusiastic support. Then a historic moment came and the work of manufacturing the first electronic computer began. 1On June 5th, 943, Moore College signed a contract with the Ordnance Department and named it "Electronic Numerical Integrator and Computer", abbreviated as ENIAC. Moore Group, which is responsible for developing Eniac, is a group of like-minded and energetic young scientific and technological personnel: eckert, the chief engineer, is only 24 years old, a graduate student of Moore College, and has done a lot of research in the field of electronics. He is responsible for solving a series of difficult and complicated engineering and technical problems in manufacturing industry; Moakley, a physics professor in his thirties, has been paying attention to the development of computer technology. He once wrote a paper "Calculation with High-speed Vacuum Tube", and he put forward the general idea of Eniac. The young A.W.Burks is a young logician. After three years of intense work, the first electronic computer finally came out in February 1946. It consists of 17468 electron tubes, 60000 resistors, 10000 capacitors and 6000 switches. It weighs 30 tons, covers an area of 160 square meters, consumes electricity of 174 kilowatts, and costs $450,000. This computer can only run 5000 additions or 400 multiplications per second, which is 1000 times faster than the mechanical relay computer. When "Eniac" was publicly displayed, the trajectory of a shell was calculated in 20 seconds, which was faster than the flying speed of the shell itself. Eniac's memory is an electronic device, not a rotating drum. It can complete tens of millions of multiplication operations a day, which is equivalent to a person working with a desktop computer for 40 years. It runs in decimal instead of binary. However, there are also a few electron tubes that work in binary mode, so the machine has to convert decimal into binary in its work, and then back to decimal when data is input and output. It has been more than 50 years since the first computer was born. During this period, computers developed at an alarming rate. First, transistors replaced electron tubes, and then, with the development of microelectronics technology, the components on computer processors and memories became smaller and smaller, and the computing speed and storage capacity of computers increased rapidly. 19941In February 1994, Intel Corporation of the United States announced that it had successfully developed the fastest supercomputer in the world, which can perform 328 billion addition operations per second (66 million times that of the first electronic computer). If people are allowed to complete the calculation in one second, it takes one person to calculate around the clock for more than 10 thousand years. Compared with today's computers, "Eniac" at that time was not as good as some advanced pocket calculators, but its birth opened a brand-new information age for mankind and brought about great changes in human society. 1996 February 14, on the 50th anniversary of the world's first electronic computer, US Vice President Al Gore started the computer again to commemorate the arrival of the information age.